<template>
    <nav>
        <router-link to="/">Home</router-link>
        |
        <router-link to="/about">About</router-link>
    </nav>
    {{ message }}
    <button @click="SetMessage(message == 'aaa' ? 'sss' : 'aaa')">SetMessage</button>
    <router-view />
</template>

<script lang="ts">
import { defineComponent, reactive, toRefs, onMounted } from 'vue';
export default defineComponent({
    setup() {
        let data = reactive({
            message: '',
        });
        const SetMessage = v => {
            data.message = v;
        };
        onMounted(() => {
            data.message == 'sss' ? SetMessage('aaa') : SetMessage('sss');
            console.log(data.message);
        });
        return { ...toRefs(data), SetMessage };
    },
});
</script>
<style lang="less">
#app {
    font-family: Avenir, Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-align: center;
    color: #2c3e50;
}

nav {
    padding: 30px;

    a {
        font-weight: bold;
        color: #2c3e50;

        &.router-link-exact-active {
            color: #42b983;
        }
    }
}
</style>
